Claudius Ptolemy, ancient astronomer and astrologer, is discussed in this episode. Discover his works, the Almagest and the Tetrabiblos, and their influence on astronomy and astrology. Explore the enduring popularity of his works during the Middle Ages and how they aligned with Aristotelian ideas. Learn about the impact of the al-Majist and its role in pre-modern Western esoteric thought. Delve into Ptolemy's theoretical background to astrology and his rejection of stars as synchronic signs. Finally, explore the translation and transmission of Ptolemy's Tetra Biblos in Western Europe.